Wolverine Vol.1 #115-118Mustang used to be a Navy Tomcat pilot, when he got out he bought a P-51 Mustang and flew in stunt shows. In a show in Iowa when Mustang pulled out of an immelman the engine gave out, the stick went dead, his instincts told him to bail out, but he could live with himself if he let the plan crash into the stands, so he rode it out and crashed in a field. Mustang nearly died but with a lot of reconstructive sugary, metal and plastic joints he was able to live again, but he never got he's eye sight again. Mustang seeked help from Professor Harper for his injuries and Professor Harper secretly turned Mustang into a Prime Sentinel. Mustang resisted his programming to kill mutants and seeked help from SHIELD, to change in back to a human.